Optimisation of operating parameters for plasma facing components detritiation
Optimisation of operating parameters for plasma facing components detritiation
复制标题
面向等离子体组件除氚操作参数的优化
DOI：
10.1016/j.fusengdes.2009.03.007
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
N. Ghirelli
中科院分区：
文献类型：
--
作者：
O. Gastaldi;N. Ghirelli
在聚变设施产生的废物管理框架内，大块中存在高氚含量是非常具体的。在维护面向等离子体的部件（PFC）时，这个问题非常敏感。为了达到几个目标（回收氚，限制废物中的氚含量），几种处理方法进行了分析，并选择热处理作为参考过程。就热核实验堆设施而言，预计将建立一个基于这种技术的氚回收站。为了更好地了解哪些参数对处理效率（衰减因子）有重要影响，回顾了处理原理和有关不同材料中氚行为的主要数据。例如，在作为某些部件上的第一层材料的Be中的低氚扩散系数会严重限制工艺性能。本文回顾了不同的工艺参数。一些重要的参数被选择，以导致足够的变化域的敏感性研究。它允许研究几种治疗方案并分析其后果。本研究的主要参数是温度水平、处理时间、炉内气氛的更新速率、是否存在Be。对这种敏感性分析的主要响应是氚化因子，但是也评估了一些其他后果，例如氚化水流量和水中的氚浓度。然后比较操作参数变化的后果，以确定最合适的操作域。
Within the framework of management of waste produced by fusion facility, the presence of high tritium content in large pieces is very specific. This question is very sensitive in the case of maintenance of plasma facing components (PFC). In order to reach several goals (tritium recovery, limitation of tritium content in the waste), several treatment methods have been analysed and thermal detritiation is selected as a reference process. In the case of ITER facility a tritium recovery station based on this technique is foreseen. In order to better understand which parameters have important influence on the efficiency of the treatment (detritiation factor), a recall of the process principle and of the main data concerning tritium behaviour in different materials is done. For example, low tritium diffusion coefficient in Be which is the material of the first layer on some components can limit drastically the process performance. In this paper a recall of the different process parameters is presented. Some important parameters are selected in order to lead a sensitivity study on adequate variation domains. It allows studying several scenarios of treatment and analysing the consequences of them. The main parameters of this study are the level of temperature, the duration of treatment, the renewal rate of the furnace atmosphere, the presence of Be or not. The main response to this sensitivity analysis is the detritiation factor, however some other consequences such as tritiated water flow rate and also tritium concentration in water are evaluated. Then the consequences of change of operating parameters are compared in order to identify what could be the most appropriate operating domain.